CN101788115A - Multispectral uniform surface light source - Google Patents
Multispectral uniform surface light source Download PDFInfo
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- CN101788115A CN101788115A CN200910237437A CN200910237437A CN101788115A CN 101788115 A CN101788115 A CN 101788115A CN 200910237437 A CN200910237437 A CN 200910237437A CN 200910237437 A CN200910237437 A CN 200910237437A CN 101788115 A CN101788115 A CN 101788115A
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Abstract
The invention relates to a multispectral uniform surface light source for generating a multispectral uniform light-emitting surface and suitable for detecting the image surface uniformity and the spectral response of photoelectronic imaging equipment, i.e. a camera and the like, belonging to the technical field of optical precision measurement. The multispectral uniform surface light source comprises a shell, a light source controller, a light source driver, a light balancing system and a multispectral light-emitting diode (LED) array, wherein the light source controller and the light source driver are fixed in the shell; the light balancing system is fixed on a light-emitting opening of the shell; the multispectral LED array is fixed in the shell, and multispectral light rays emitted by the multispectral LED array are emitted out of the light-emitting opening of the shell after penetrating through the light balancing system; a light balancing plate scatters the light rays emitted by the multispectral LED array to generate a multispectral uniform lambert surface, and the illumination of the lambert surface can be regulated. The light source has high brightness and small volume and can realize the spectral turning flashing and the multispectral colour mixing and meet the requirements of the fast detection and calibration of the image surface uniformity and the dynamic spectral response of a photoelectronic imaging system.
Description
Technical field
The invention belongs to the optical imagery technical field of measurement and test, can be used for generating multispectral uniformly light-emitting face, be applicable to that mainly the image planes uniformity of photoelectronic imaging equipment such as camera and spectral response detect.
Technical background
The photo electric imaging system development of Space Science and Technology industrial circle has been added the high-performance optical electric imaging system on current many novel imaging satellite platforms rapidly.Optoelectronic device has become payload important on the satellite as " eyes " of satellite, is mainly used in to realize the observation and mapping function of target over the ground.
Core component in the photo electric imaging system---high accuracy ccd image sensor is made up of discrete photosensitive pixel.Although the geometric accuracy of modern sensor is very high, the responsiveness of each pixel is still different to some extent, and deviation will certainly appear in the picture signal of output; Because the vignetting that causes in the design of optical lens and the processing also can influence the variation of image planes brightness.This two aspects reason can cause the inhomogeneities of photo electric imaging system image planes, can influence satellite to the identification of targets ability and strengthened the difficulty that image is handled.
Photo electric imaging system also has the multispectral imaging ability usually in recent years, and multispectral imaging not only can be differentiated atural object according to the form of image and the difference of structure, can also differentiate the material type on ground according to the difference of spectral characteristic.The spectral responsivity of multispectral imaging camera different spectral coverage can directly have influence on the spectral remote sensing precision of target over the ground, and influence is to the discriminating power of atural object.
At present, the image planes uniformity of star loaded camera and spectral responsivity detect and demarcate, and need to use integrating sphere and multispectral light source.Test macro as shown in Figure 7, the emergent ray of multispectral light source is through at the integrating sphere inner surface repeatedly after the scattering, can form evenly to be higher than 95% lambertian.Adjust tested camera and aim at the integrating sphere outlet, take lambertian, by analyzing the image planes uniformity that the image of camera file can obtain camera.By adjusting the outgoing illumination and the outgoing spectrum of multispectral light source, analyze the camera image under many different illumination conditions again, can draw the spectral responsivity parameter of camera.
Use the certainty of measurement height of integrating sphere detection camera performance, but bulky, the complicated operation of integrating sphere only are applicable to detection in the laboratory of camera, can not satisfy the fast detecting demand of camera in development, assembling, debug process.Therefore, at spaceborne high resolution multispectral imaging camera now, be badly in need of that a kind of volume is little, in light weight, bore is big, the multispectral uniform surface light source of good portability, requires that its illuminance uniformity is better than 95%, adjustable, the luminous spectral coverage of outlet illumination linearity is changeable.
At present, low profile light source technology development in the demonstration field, plane rapidly, wherein mainly be based on the area source of LGP as light-conductive media, patent has: ZL03101472.0, ZL03126820.X, US4714983, US4974122, US6608614B1, these area sources have little, the lightweight characteristics of volume.But because the restriction of LGP operation principle, generally, the image planes uniformity of bigbore LGP area source can not satisfy the basic demand of uniformity test about 85%.
As the novel illumination light source of another kind of extensive use, the LED device has the advantages that luminous efficiency height, volume are little, the life-span is long.Use astigmatism plate and curved surface reflector to constitute area source in the patent 200810104199.7, have good stability and security reliability, but curved surface reflector processed complex wherein, and area source profile thickness is bigger.In the another kind of LED area source owing to use the led array illumination, do not need LGP or reflector, for example patent CN201057435Y adopts adjustable constant-flow source driving LED array, provide that a kind of volume is little, high evenly, the uniform area light source of low heat emission, but this device does not have multispectral characteristic, can not realize that multiple spectral responsivity detects.Among the patent CN2852594Y, adopt the LED of multiple color to constitute led array, provide a kind of tone variable area source, but the PWM type of drive that it adopts can make led array produce high frequency flicker, this high frequency flicker human eye is not discernable, but can cause the instability of the lightness of tested camera, influence the camera measurement accuracy.
Problem at above area source existence, the present invention adopts multispectral led array and even photosystem to generate even lambertian, provide that a kind of volume is little, in light weight, the multispectral area source of good uniformity, replenish as the useful of integrating sphere high-acruracy survey means, satisfy the fast detecting and the demarcation demand of camera uniformity and spectral responsivity.
Summary of the invention
The objective of the invention is fast detecting and demarcation demand, propose a kind of multispectral uniform surface light source, utilize and spare the light that the multispectral led array of photosystem scattering sends, generate the even lambertian of multiple spectrum in order to satisfy camera uniformity and spectral responsivity.
The objective of the invention is to be achieved through the following technical solutions.
Multispectral uniform surface light source of the present invention comprises casing, and the light source controller and the light source drive that are fixed on casing inside, and wherein light source controller is connected with light source drive by circuit; Also comprise even photosystem and multispectral led array, wherein even photosystem is fixed on the light-emitting window of casing, and multispectral led array is fixed in casing inside, and the light-emitting window that the multispectral light that multispectral led array penetrates sees through behind the even photosystem by casing penetrates.
Described light source controller can dynamically switch the emission spectrum of multispectral led array, forms the spectrum wheel and dodges.
Described multispectral led array is made of a plurality of LED unit, can or evenly arrange according to equilateral triangle or square or hexagonal array in adjacent LED unit, and each LED unit is made of the LED lamp of two different spectrum at least.
Described LED lamp is single spectrum LED or multispectral LED.
The LED lamp that has same spectra in the described multispectral led array is connected with light source drive by circuit then by mutual serial or parallel connection of circuit or series-parallel connection.
Described even photosystem is made of at least one transmittance plate with multispectral diffuse-reflecting power.
Described multispectral uniform surface light source can also comprise operation interface, and operation interface is connected with light source controller by holding wire.
Described multispectral uniform surface light source can also comprise operation interface, network, computer, and wherein computer is connected with operation interface by network.
Described multispectral uniform surface light source can also comprise the interface that is installed, and is connected with the measurand light inlet with casing.
Beneficial effect
The present invention contrasts prior art and has following remarkable advantage:
Propose a kind of multispectral uniform surface light source, it utilizes multiple spectrum LED spatial arrangement to constitute multispectral led array, and the light that sends can generate multispectral even lambertian after even photosystem scattering, and this is one of innovative point that is different from prior art.
Dynamically switch the emission spectrum of multispectral led array by light source controller, form the spectrum stroboscopic, the spectrum dynamic response that can be used for camera detects, this be different from prior art innovative point two.
Characteristics of the present invention:
1. the hardware in the light source casing includes only even photosystem and multispectral light source circuit board, and spectral coverage can be selected, and the illumination of lambertian is adjustable, good uniformity, and system weight is light, volume is little, good portability.
2. light source can adopt current stabilization or voltage regulation way to drive multispectral led array, compares the light-source brightness good stability with the dimming mode of pulsewidth modulation (PWM).
3. light source can directly be connected with the measurand light inlet by the interface that is installed, and the installation of light source does not need other supporting mechanisms, and is easy for installation.Simultaneously can prevent that extraneous light from entering the clear aperture of tested camera, measuring process need not carried out in the darkroom.
4. the user can be connected with operation interface by computer and network, realizes the computer remote control of light source.
5, by changing the luminous intensity of each spectrum, can realize multispectral colour mixture.
Description of drawings
Fig. 1 is the device schematic diagram of multispectral uniform surface light source of the present invention;
Fig. 2 is the local circuit schematic diagram of multispectral led array among the present invention;
Fig. 3 is the system schematic of the embodiment of the invention;
Fig. 4 is the front circuit of multispectral light source circuit board in the embodiment of the invention;
Fig. 5 is the reverse side circuit of multispectral light source circuit board in the embodiment of the invention;
Fig. 6 is the circuit connecting relation schematic diagram of LED lamp;
Fig. 7 measures the inhomogeneity testing arrangement sketch of camera for integrating sphere;
Wherein: the tested camera light inlet of 1-, the 2-interface that is installed, 3-spares photosystem, 4-multispectral light source circuit board, the 5-casing, the 6-operation interface, the 7-network, the 8-computer, the 9-power supply, the 10-light source drive, the 11-light source drive, the 12-light source drive, the 13-light source controller, the multispectral led array of 14-, 15-industry control man-machine interface, the 16-switch, the 17-LED unit, the 18-red LED lamp, the 19-green LED lamp, 20-blue led lamp, 21-near-infrared LED lamp, 22-adjustable constant-flow source, 23-adjustable constant-flow source, 24-adjustable constant-flow source, 25-adjustable constant-flow source, the 26-single-chip microcomputer, the 27-serial port circuit, the 28-integrating sphere, the 29-multispectral light source, the outlet of 30-integrating sphere, the 31-LED lamp, the 32-red LED lamp, the 33-green LED lamp, 34-blue led lamp, 35-near-infrared LED lamp.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Basic thought of the present invention is output current or an electric current of adjusting light source drive by light source controller, realizes that the spectrum of multispectral led array switches and the illuminance adjusting, and then generates the even lambertian of multiple spectrum by the diffusing characteristic diffuser of even photosystem.
Embodiment
Present embodiment is the multispectral uniform surface light source at the tested camera of clear aperture 150mm, can generate the uniformly light-emitting face of red, green, blue, four spectrum of near-infrared.
As shown in Figure 3, comprise the interface 2 that is installed, even photosystem 3, multispectral light source circuit board 4, casing 5,15-industry control man-machine interface, switch 16, computer 8, power supply 9 in the multispectral uniform surface light source.
Wherein:
The interface 2 that is installed is connected with casing 5, and is identical with the outside dimensions of measurand light inlet 1 along size in it, whole area source can be fixed on the measurand light inlet 1.
Even photosystem 3 is installed on the light-emitting window of casing 5, between measurand light inlet 1 and multispectral light source circuit board 4.Even photosystem 3 is selected the circular opal glass of bore 180mm for use, but the multispectral light of scattering multispectral light source circuit board 4 emissions forms multispectral even lambertian.
Multispectral light source circuit board 4 is connected with power supply 9 by cable, is connected with industry control man-machine interface 15 by the rs 232 serial interface signal line.Multispectral light source circuit board 4 can be realized the switching and the illumination adjusting of emission spectrum by power supply 9 power supplies under the control of industry control man-machine interface 15.
As Fig. 4, shown in Figure 5, above-mentioned multispectral light source circuit board 4 is the circular circuit board of 200mm diameter, is made of multispectral led array 14, single-chip microcomputer 26, adjustable constant-flow source 22, adjustable constant-flow source 23, adjustable constant-flow source 24, adjustable constant-flow source 25 and serial port circuit 27.
Wherein Fig. 4 is the front of multispectral light source circuit board 4, and the luminescence unit of multispectral light source circuit board 4 is multispectral led array 14, and diameter 180mm is made up of 36 LED unit 17, and the level interval between the adjacent LED unit is identical with vertical interval.LED unit 17 is made of the LED lamp of 4 kinds of spectrum, 4 LED lamps are square arrangement, level interval between the LED lamp is identical with vertical interval, wherein the wavelength of red LED lamp 18 is 620nm, the wavelength of green LED lamp 19 is 525nm, the wavelength of blue led lamp 20 is 465nm, and the wavelength of near-infrared LED lamp 21 is 850nm.
Fig. 5 is the reverse side of multispectral light source circuit board 4, and single-chip microcomputer 26 wherein is light source controllers, and adjustable constant-flow source 22, adjustable constant-flow source 23, adjustable constant-flow source 24, adjustable constant-flow source 25 are light source drives.Single-chip microcomputer 26 is connected with adjustable constant-flow source 22, adjustable constant-flow source 23, adjustable constant-flow source 24, adjustable constant-flow source 25 by circuit respectively.Single-chip microcomputer 26 can pass through serial port circuit 27 and 15 communications of industry control man-machine interface, and according to the control instruction that serial port circuit 27 receives, disposes the driving current value in each adjustable constant-flow source respectively.Constant-current driven chip LT3598 is adopted in four adjustable constant-flow sources, and wherein adjustable constant-flow source 22 provides electric current for 36 blue led lamps in the multispectral light source circuit board 4 provide electric current, adjustable constant-flow source 25 for 36 near-infrared LED lamps in the multispectral light source circuit board 4 for 36 green LED lamp in the multispectral light source circuit board 4 provide electric current, adjustable constant-flow source 24 for 36 red LED lamp in the multispectral light source circuit board 4 provide electric current, adjustable constant-flow source 23.
The circuit connecting relation of LED lamp as shown in Figure 6 in four adjustable constant-flow sources and the multispectral light source circuit board 4: wherein 6 red LED lamp are connected into one group, and the red LED lamp of 6 groups of series connection are connected with adjustable constant-flow source 22; 6 green LED lamp are connected into one group, and the green LED lamp of 6 groups of series connection is connected with adjustable constant-flow source 23; 6 blue led lamps are connected into one group, and the blue led lamp of 6 groups of series connection is connected with adjustable constant-flow source 24; 6 near-infrared LED lamps are connected into one group, and the near-infrared LED lamp of 6 groups of series connection is connected with adjustable constant-flow source 22.
The advantage of technique scheme is:
The light that the multispectral led array 14 of photosystem 3 scatterings sends is spared in the multispectral uniform surface light source utilization, can generate the even lambertian of multiple spectrum, and the illumination of lambertian is adjustable.
Single-chip microcomputer 26 in the multispectral light source circuit board 4 can pass through the emission spectrum that multispectral led array 14 is dynamically switched in adjustable constant-flow source 22, adjustable constant-flow source 23, adjustable constant-flow source 24 and adjustable constant-flow source 25, forms the spectrum wheel and dodges.
Single-chip microcomputer 26 in the multispectral light source circuit board 4 can pass through the intensity of emission spectra that adjustable constant-flow source 22, adjustable constant-flow source 23, adjustable constant-flow source 24 and adjustable constant-flow source 25 change multispectral led array 14, realizes multispectral colour mixture.
Include only even photosystem 3 and multispectral light source circuit board 4 in the light source casing 5, system weight is light, volume is little, good portability, and interface 2 can directly be fixed on the measurand light inlet 1 by being installed.The casing 5 of interface 2 and light source of being installed can prevent that extraneous light from entering measurand light inlet 1, so test process need not carry out in the darkroom.
Multispectral light source circuit board 4 adopts the LT3598 chip to make up the adjustable constant-flow source, drives multispectral led array 14, compares with the type of drive of PWM, and light-source brightness is stable, does not have high frequency flicker.
The user can change the drive current of adjustable current source by the operation interface control single chip computer 26 of industry control man-machine interface 15, realizes that the spectrum of multispectral led array 14 switches and the illuminance adjusting.
The user can to industry control man-machine interface 15 sending controling instructions, realize the Long-distance Control of light source by the primary control program of installing on the computer 8.
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described; but these explanations can not be understood that to have limited scope of the present invention; protection scope of the present invention is limited by the claims of enclosing, and any change on claim of the present invention basis all is protection scope of the present invention.
Claims (9)
1. multispectral uniform surface light source is characterized in that: comprise casing, and the light source controller and the light source drive that are fixed on casing inside, wherein light source controller is connected with light source drive by circuit; Also comprise even photosystem and multispectral led array, wherein even photosystem is fixed on the light-emitting window of casing, and multispectral led array is fixed in casing inside, and the light-emitting window that the multispectral light that multispectral led array penetrates sees through behind the even photosystem by casing penetrates.
2. according to right 1 described multispectral uniform surface light source, it is characterized in that: described light source controller can dynamically switch the emission spectrum of multispectral led array, forms the spectrum wheel and dodges.
3. according to right 1 described multispectral uniform surface light source, it is characterized in that: described multispectral led array is made of a plurality of LED unit, adjacent LED unit is according to equilateral triangle or square or hexagonal array or evenly arrange, and each LED unit is made of the LED lamp of two different spectrum at least.
4. according to right 3 described multispectral uniform surface light sources, it is characterized in that: described LED lamp is single spectrum LED or multispectral LED.
5. according to right 1 described multispectral uniform surface light source, it is characterized in that: the LED lamp that has same spectra in the described multispectral led array is connected with light source drive by circuit then by mutual serial or parallel connection of circuit or series-parallel connection.
6. according to right 1 described multispectral uniform surface light source, it is characterized in that: described even photosystem is made of at least one transmittance plate with multispectral diffuse-reflecting power.
7. according to right 1 described multispectral uniform surface light source, it is characterized in that: can also comprise operation interface, operation interface is connected with light source controller by holding wire.
8. according to right 1 described multispectral uniform surface light source, it is characterized in that: can also comprise operation interface, network, computer, wherein computer is connected with operation interface by network.
9. according to right 1 described multispectral uniform surface light source, it is characterized in that: can also comprise the interface that is installed, be connected with the measurand light inlet with casing.
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| CN200910237437A CN101788115A (en) | 2009-11-06 | 2009-11-06 | Multispectral uniform surface light source |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573234A (en) * | 2012-01-11 | 2012-07-11 | 复旦大学 | Design method of variable-spectrum dimmable light-emitting diode (LED) illuminating system |
| CN103872210A (en) * | 2012-12-17 | 2014-06-18 | 欧普照明股份有限公司 | Packaging structure |
| CN105632353A (en) * | 2016-03-15 | 2016-06-01 | 宏齐光电子(深圳)有限公司 | Energy-saving LED advertisement screen |
| CN106090700A (en) * | 2016-06-06 | 2016-11-09 | 北京理工大学 | Super large subtended angle multispectral lambertian lighting source |
| CN107192456A (en) * | 2017-06-22 | 2017-09-22 | 温州大学 | A kind of color measuring multi-optical spectrum imaging system based on LED illumination |
| CN108324241A (en) * | 2018-01-22 | 2018-07-27 | 深圳盛达同泽科技有限公司 | Multispectral light source, eyeground imaging system and imaging method |
| CN111102478A (en) * | 2018-10-09 | 2020-05-05 | 北京国科亿欧科技有限责任公司 | Multispectral adjustable LED light source |
| CN112492069A (en) * | 2020-11-20 | 2021-03-12 | 华东师范大学 | Multispectral imaging method for stroboscopic mobile phone |
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2009
- 2009-11-06 CN CN200910237437A patent/CN101788115A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102573234A (en) * | 2012-01-11 | 2012-07-11 | 复旦大学 | Design method of variable-spectrum dimmable light-emitting diode (LED) illuminating system |
| CN103872210B (en) * | 2012-12-17 | 2017-06-27 | 欧普照明股份有限公司 | A kind of encapsulating structure |
| CN103872210A (en) * | 2012-12-17 | 2014-06-18 | 欧普照明股份有限公司 | Packaging structure |
| WO2014094349A1 (en) * | 2012-12-17 | 2014-06-26 | 欧普照明股份有限公司 | Led packaging structure |
| CN105632353A (en) * | 2016-03-15 | 2016-06-01 | 宏齐光电子(深圳)有限公司 | Energy-saving LED advertisement screen |
| CN106090700B (en) * | 2016-06-06 | 2017-09-19 | 北京理工大学 | The multispectral lambert's flat lighting source of super large subtended angle |
| CN106090700A (en) * | 2016-06-06 | 2016-11-09 | 北京理工大学 | Super large subtended angle multispectral lambertian lighting source |
| CN107192456A (en) * | 2017-06-22 | 2017-09-22 | 温州大学 | A kind of color measuring multi-optical spectrum imaging system based on LED illumination |
| CN107192456B (en) * | 2017-06-22 | 2018-07-10 | 温州大学 | A kind of color measuring multi-optical spectrum imaging system based on LED illumination |
| CN108324241A (en) * | 2018-01-22 | 2018-07-27 | 深圳盛达同泽科技有限公司 | Multispectral light source, eyeground imaging system and imaging method |
| CN108324241B (en) * | 2018-01-22 | 2024-02-02 | 深圳盛达同泽科技有限公司 | Multispectral light source, fundus imaging system and imaging method |
| CN111102478A (en) * | 2018-10-09 | 2020-05-05 | 北京国科亿欧科技有限责任公司 | Multispectral adjustable LED light source |
| CN112492069A (en) * | 2020-11-20 | 2021-03-12 | 华东师范大学 | Multispectral imaging method for stroboscopic mobile phone |
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Open date: 20100728 |